Automating HADR in 2 node HACMP Cluster

I want to understand the steps involved in automating HADR in 2 node HACMP cluster. To my knowledge usually db2haicu tool is used to automate HADR. However on a system which is already in a cluster setup, do i need to follow some extra step/care while running db2haicu or once invoked db2haicu will itself pick the cluster information?

Thanks Nallu. My question is , if there is an existing HACMP cluster, will
there be any additional steps involved in running db2haicu? also i guess we
can use the same ip's as used for existing hacmp nodes. i have not actually
done this, so just trying to figure out the steps, and avoid any mistakes.